(1)/CSA:Chip Selection For ICA.
(2)/CSB:Chip Selection For ICB.
(3)VSS:Ground (0V).
(4)VDD:Supply Voltage for Logic (+5V).
(5)VO:Contrast adjustment.
(6)D/I:Data or Instruction.
(7)R/W:Read or Write.
(8)E:Enable signal.
(9-16)DB0-DB7:Data Bus Line.
(17)/RST:Reset.
(18)VEE:Negative Power Supply Output ( -5V ).
(19)LEDA:LED Back-light Power Supply + (5V).
(20)LEDK:LED Back-light Power Supply - (5V).